1 feb 1802 anni - 1803 AD:
John Dalton, a chemist and
schoolteacher performed
various experiments related
to atoms such as mixing
gases and explaining compounds.
In 1803, he came up with
the very first atomic theory:
Atoms of the same element
are identical, Atoms of different
elements have different weights
and chemical properties,
compounds are formed when
elements are combined and
atoms cannot be created or
destroyed. He also created the
very first model of what an atom
would look like.